To help you find the most stable version for your specific device:
The YouTube app no longer officially supports iOS 10.3.4, which is the final software version for older 32-bit devices like the iPhone 5 and iPad 4. Users seeking a functional YouTube experience on these legacy devices typically rely on or editing application data via a jailbreak. Installing YouTube on iOS 10.3.4 youtube ipa for ios 1034 link
In late 2022, a permanent sideloading utility called was released. It allows users on iOS 14.0 up to iOS 15.4.1 to install IPAs permanently without 7-day revokes. To help you find the most stable version